Method for producing an abrasion-resistant coating on surface of 3D printed titanium alloy components

Abstract

The present invention relates to a method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component, which belongs to the field of surface modification. The method comprises using spherical TC4 titanium alloy powder as a base material and adopting selective laser melting (SLM) technology to manufacture a 3D printed titanium alloy component in a layer-by-layer stacking manner, using graphene oxide to perform friction-induction treatment, and making the graphene oxide infiltrate into the surface of the TC4 titanium alloy component to obtain a graphene oxide surface coating. The goal of improving the friction and wear performance of the TC4 titanium alloy printed components is achieved. The preparation method is simple, and the steps are easy to operate. Introducing the graphene oxide is beneficial to reduce the generation of wear debris during the friction and wear processes and improve tribological characteristics of the base material.

What is claimed is: 
     
       1. A method for producing an abrasion-resistant coating on surface of a three-dimensional (3D) printed titanium alloy component, comprising:
 using spherical TC4 titanium alloy powder with particle size of 4-70 μm as a printing material, and putting the spherical TC4 titanium alloy powder in a vacuum drying oven for a drying treatment to obtain dried TC4 titanium alloy powder; 
 adding the dried TC4 titanium alloy powder into a powder supplying bin of a selective laser melting (SLM) 3D printer, setting reasonable laser scanning parameters, laser-scanning and stacking the TC4 titanium alloy powder layer by layer until a component is formed, and then peeling off the formed component and polishing and cleaning the formed component to obtain a 3D printed titanium alloy component; 
 drying graphene oxide powder and adding the dried graphene oxide powder on top of a friction-induction tool and applying a pre-compression pressure of 5-10 N/m 2  for 3-5 minutes on the graphene oxide powder to spread the graphene oxide powder on top of the friction-induction tool; 
 fixing the 3D printed titanium alloy component on a friction and wear testing machine and pressing the friction-induction tool on the surface of the 3D printed titanium alloy component under a working pressure of 12-15 N/m 2 , and then performing reciprocating friction-induction operations along a planned path to infiltrate the graphene oxide powder into the 3D printed titanium alloy component to form an abrasion-resistant coating; and 
 washing the component with deionized water and blow-drying the component with a blow-dryer. 
 
     
     
       2. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein the drying treatment is carried out at 100-120° C. for 2.5-3.5 hours. 
     
     
       3. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein the laser scanning parameters comprise 180-220 W laser power, 1200-1400 mm/s scan speed, 110-150 μm scan pitch and 28-32 μm scan thickness. 
     
     
       4. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein wire cutting process is adopted to peel off the formed component. 
     
     
       5. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein the formed component is polished with an alumina polishing solution, washed with an ethanol solution and dried. 
     
     
       6. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein the 3D printed titanium alloy component is ground with 1000 grit, 1200 grit, 1500 grit and 2000 grit sandpapers in sequence. 
     
     
       7. The method for producing an abrasion-resistant coating on surface of a 3D printed titanium alloy component according to  claim 1 , wherein the spherical TC4 titanium alloy powder is manufactured by a plasma atomization process.